Signaling system



Oct. 25, 1932. c. L. DAVIS SIGNALING SYSTEM Filed July 10, 1928 INVENTOR. [Qwmi a ATTORNEY Patented Oct. 25, 1932 1,884,5ti-Z rrE STATES PATENT OFFICE CHESTER L. DAVIS, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOB TO WIRED RADIO, INC., 0] NEW YORK, N. Y., A CORPORATION OF DELAWARE SIGNALING- SYSTEM Application filed July 10, 1928.

My invention relates to signaling systems in general and more specifically to receiving systems wherein thermionic vacuum tubes are employed.

An object of my invention is to provide a system for the reception of high frequency signaling energy employing thermionic vacuum tubes whereby all batteries as a source of energy are dispensed with.

Another object of my invention is to pro vide a system for the reception of high frequency signaling energy whereby the necessary energy for energizing the thermionic vacuum tubes is derived from electrodynamic means and a source of tension motive power.

A. further object of my invention is to provide a system for energizing thermionic vacuum tubes employed in amplifier and transmitter circuit arrangements.

Other and further objects of my invention will appear from the specification to follow and by referring to the accompanying drawing in which:

Figure 1 is a representation of the embodiments of my invention; and Fig. 2 is a representation of one embodiment of my invention in greater detail.

In signaling systems wherein thermionic vacuum tubes are employed for the generation, amplification and rectification of high frequency electrical energy, it is necessary to employ a s rsce of electrical energy for the cathode and anode circuits. Batteries have been employed heretofore for this purpose and are satisfactory when fully charged with energy. It becomes necessary to renew the batteries or have them recharged. and this is a considerable inconvenience and expense. The power systems employed for commercial power and lighting have been employed but the latte is not available wherever it is desired to operate high frequency signaling systems. It is possible to operate naling systems without employing the conventional thermionic vacuum tube but the efficiency of the thermionic vacuum tube is sufficient justification for its use in preference to other possible systems. In the signaling system of my invention all batteries as a source of power are dispensed with.

Serial No. 291,538.

In the signaling system of my invention electro-dynamic means are employed in combinati on with a mechanical tension source of energy for producin the necessary electrical energy to energize the circuits of thermionic vacuum tubes. By referring to Fig. 1 a better understanding can be hat. of the system I employ. Fig. 1 illustrates a radio receiving system in its entirety. Thermionic vacuum tubes 1, 2 and 3 are employed a radio frequency amplifier, rectifier and audio frequency amplifier respectively A source of high frequency energy is received by any convenient collecting system and coupled to the input circuit 12 by connections A capacity 15 is employed for adjusting the frequency characteristics of the grid or input circuit of thermionic vacuum tube 1 to the frequency value of the incoming signaling energy. The amplified radio frequency signaling energy is amplified and transferred by inductance system 13 to thermionic c uum tube detector 2 which is caused to rect the radio frequency energy by reason of grid leak and condenser 14. The audio frequency component of the rectified signaling ene coupled to thermionic vacuum tube 3 through transformer 10. The output energy of thermi onic vacuum tube 3 is coupled r-eproducer 21 by means of capacity 25 and impedance 11. Electrodynamic source of energy 6 supplies the proper electrical potential to the catho e and anode circuits of thermimiic vaci tubes 1, 2 and 3. A resistor 26 may be e ployed in circuit with the output of eh-aso dynamic source of electrical energy 6 for reducing the potential to either of e cathode or anode circuits. Electrodyna -c source of energy 6 may be a dynamo-electric machine coniprise a large number of commutator segments. Capacity 17 is of large value and sufficient to prevent fluctuation of potential in the cathode and anode circuits caused by commutation. Dynamo-electric machine 6 is mounted on a sound deadening base 24. he armature of dynamo-electric machine 6 is rotated by a mechanical tension source of en argy 28. Mechanical tension source of energy is energized by resilient means 18. The resilient means may be compound whereby suiticient tension is maintained to rotate the arms.- ture of dynamo-electric machine 6 for a greater period of time. Resilient means 18 is energized by means of crank 9 at cc 1 intervals thereby restoring the moon tension.

1. Mechanical energy is transferred from resilient means 18 to system and shaft 30. Shaft 30 is mechanically connected to the armature ofdynamo-electric mac Governor 20 controls the speed of rot of shaft 30, connected to the armature dynamo-electric machine 6, as determined the position of movable arm 19. T he governor 29 carries a friction disc 31 which b against the friction face 32 at the end of 19. Arm 19 is pivoted. at on brac and may be moved to predeterm d posi-Jio. and latched. in position by me of toothed ratchet 34. Movable arm 19 thereby controls the potential'from dynamo-electric maciiine 6 by controlling the operation goverior 20 and the rotation of the arm c. This vides an efficient and effective volume control by controlling'the potential. supplied to the cathode and anode circuits. .Gcar. system 22 is illustrated as mechanically coup-ll the energy from resilient means 18, to sham 80, however, it is obvious that a pulley and belt system would cause less noise in the transf of the mechanical energy. A. weight s;

nay be employed instead of the resilient means illustrated. Dynam o-electric machine 6 and tension motor may be enclosed in any suitable sound deadening compartment and isolated. from the receiver 'iroper as illustrated inFig. 2.

ln Fig. 2 of the accompanying drawing the source of dynamo-electric en rgy 6 ,and tension motor 28 are illustrated in greater detail. mechanical tension is obtained by means of a compound resilient element 18. A tension is produced by means of crank 29. The mechanical tension is rt ed bymeans of shaft 30 and 22. Mechanical tension is transferred shalt 30 on which governor 20 is mounted. Governor 20 is controlled by disc 16 and control member 19. A. rotary motionis transmitted to the arm .ure of dynamo-electric machine 6. Commutators 7 and 8 connected to the armature and brushes 1% ll, 12 and 1S and provide means for transferring the genera ed electrical energy to terminals 9. Field windings A- and 15 are illustrated connected in shunt With brushes 10, 11 and 12, 13 respectively. Sound be obtained without the IIBCGSSiiLY of employing batteries. 8. The operation of remote control broadcast amplifier systems. 4. The operation of complete transmitting and re ceiving systems, employing thermionic vacuum tubes, in isolated locations.

In the accompanying drawing a radio frequency amplifier, detector and audio frequency amplifier are illustrated. Tt is obvious that'any number of thermionic vacuum tubes mayv be employed. Only energy supply for the cathode and anode circuits is illustrated. It is obvious that any required electrical energ may be produced. Gear mechanism is illustrated for transmitting mechanical energy. It is likewise obvious that a pullcy and belt system may be employed. 1 re- 'ze that many modifications of my inven- -on are possible Without departing from the spi it of my invention as defined in the appended claim. is not intended that my invention be limited to the accompanying r or to the foregoing specification but prising electron tube amplifier connected 7 to a sound reproducer, means enclosing said amplifier, a tuning control for said amplifier pr beyond saidineans and operative from the exterior thereof, a generator for energizing the anode and cathode circuits of said an ifier, a spring motor adapted to be periodi wound for the storage of tension energ therein a speed multiplication gear connecting said spring motor with said gen- :or; a governor connected with said speed multiplication gear, and a control extending outside of said enclosin meansfor modifying the effect of said spring motor upon said "enerator for simultaneousb re ulating the 3, I I I. 1 b1 energization 01' the anode and cathode c1rs said ampliner by said generator for S13GI1llllg y controlling the volume of sound reproduced by said sound reproducer. Tn testimony whereof I alliX my signature.

, onnsrnn L. DAVIS. 

